Calendar is pulling from two data programs

I inherited my husbands blackberry from his work.
I have been able to clear out all of his calendar and contact information.
I have set-up my Outlook to synch with the blackberry. However when it synchs, it now only transfers my info from Outlook but it synchs all of his old stuff from work.
I have gone to the calendar app on my BB and chose options - both his desktop and my email account show up. I turned off the wirless synch. on his desktop. Can't figure out why it still synchs.
Am I stuck with his 500 calendar appointments synching to my blackberry since it was set up at work?